Poor customer service with disconnected wifi using my own data and pay the wifi bill

I purchase wifi 8months ago. I had problems right from the beginning. I inform 2 consultancy but they could not resolve the matter. They just let it hang in the air whereas I had to pay ever month. They told me to shift the router all around but still it didn't help. After that when I phone them I don't get reply. This morning I couldn't connect to the internet for half of the data. I had to use my own data so many times. I cannot receive calls or have a decent video call then the wifi disconnect. I just had enough of this service. I'm looking at other service providers to assist me. I have the standard package now, but it's not worth because if you can't really connect to the wifi when you desperately need it, then what is the point. Really poor poor service. I'll probably hear from them when I don't pay.